push add to transaction logic down to the instance

the transaction object shouldn't know so much about active record
objects, so let's push the conditionals in to the instance.

activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb

@@ -234,6 +234,10 @@ def add_transaction_record(record)
         current_transaction.add_record(record)
       end
 
+      def transaction_state
+        current_transaction.state
+      end
+
       # Begins the transaction (and turns off auto-committing).
       def begin_db_transaction()    end
 

activerecord/lib/active_record/connection_adapters/abstract/transaction.rb

@@ -55,11 +55,7 @@ def initialize(connection, options)
       end
 
       def add_record(record)
-        if record.has_transactional_callbacks?
-          records << record
-        else
-          record.set_transaction_state(@state)
-        end
+        records << record
       end
 
       def rollback

activerecord/lib/active_record/transactions.rb

@@ -318,7 +318,11 @@ def rolledback!(force_restore_state: false, should_run_callbacks: true) #:nodoc:
     # Add the record to the current transaction so that the +after_rollback+ and +after_commit+ callbacks
     # can be called.
     def add_to_transaction
-      self.class.connection.add_transaction_record(self)
+      if has_transactional_callbacks?
+        self.class.connection.add_transaction_record(self)
+      else
+        set_transaction_state(self.class.connection.transaction_state)
+      end
       remember_transaction_record_state
     end